From 7e1a80d79f0bd278f380eeef9429415f37436190 Mon Sep 17 00:00:00 2001
From: Alfi Maulana <alfi.maulana.f@gmail.com>
Date: Wed, 27 Dec 2023 13:35:52 +0700
Subject: [PATCH] feat(example): add `print_hex` example

---
 examples/CMakeLists.txt |  4 ++++
 examples/print_hex.cpp  | 27 +++++++++++++++++++++++++++
 2 files changed, 31 insertions(+)
 create mode 100644 examples/print_hex.cpp

diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index 54634d2..113427a 100644
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -1,5 +1,9 @@
 add_custom_target(examples)
 
+add_executable(example_print_hex print_hex.cpp)
+target_link_libraries(example_print_hex PRIVATE errors)
+add_dependencies(examples example_print_hex)
+
 add_executable(example_read_file read_file.cpp)
 target_link_libraries(example_read_file PRIVATE errors errors_format)
 add_dependencies(examples example_read_file)
diff --git a/examples/print_hex.cpp b/examples/print_hex.cpp
new file mode 100644
index 0000000..0564c1a
--- /dev/null
+++ b/examples/print_hex.cpp
@@ -0,0 +1,27 @@
+#include <errors/error.hpp>
+#include <iostream>
+
+errors::Error print_hex(const char* number_str) {
+  int number = std::atoi(number_str);
+  if (number == 0) {
+    return errors::make("is not a number");
+  }
+
+  std::cout << std::hex << number << std::endl;
+  return errors::nil();
+}
+
+int main(int argc, char **argv) {
+  if (argc < 2) {
+    std::cerr << "usage: " << argv[0] << " <number>" << std::endl;
+    return 1;
+  }
+
+  const auto err = print_hex(argv[1]);
+  if (err) {
+    std::cerr << err << std::endl;
+    return 1;
+  }
+
+  return 0;
+}